Dynamic property optimization design method for foundation major parts of machine tool

Abstract

The invention discloses a dynamic property optimization design method for foundation major parts of a machine tool. The method includes the steps that a machine tool assembly is simplified according to the dynamics simulation analysis requirement, and the simplified assembly is imported into ANSYS/Workbench for mesh generation, material setting and boundary condition setting to complete modal analysis of the machine tool assembly; in harmonic response analysis, the maximum amplitude response values of the end of a spindle box of the machine tool assembly under the action of simple harmonic force in the X direction, the Y direction and the Z direction are obtained by simulating the actual working state of a tool; finally, experiment design of quality characteristic parameters of the foundation major parts is carried out with the parametric analysis technology, and a response surface model between the dynamic property response values of the machine tool and the quality characteristics of the foundation major parts is obtained through fitting. By analyzing the response surface model, the weak link of the foundation major parts in the dynamic property of the machine tool can be qualitatively found out, the tendency of influences of changes of the foundation major parts on the dynamic property of the machine tool can be quantitatively predicted, and the precision of machine tool design can be improved.

Description

technical field [0001] The invention relates to the field of optimal design of numerical control machine tools, in particular to a method for optimal design of the dynamic performance of large machine tool foundations. Background technique [0002] The good performance of the machine tool requires that the basic parts of the machine tool have good static performance and dynamic performance. At present, the machine tool design method still uses the traditional method of experience and analogy to design the static strength and static stiffness of the machine tool, and does not realize the important influence of the dynamic characteristics of the machine tool on the performance of the machine tool. Now, CNC machine tools are developing in the direction of high precision, high processing quality, high stability and high productivity, and the dynamic performance of machine tools has become an important indicator to measure the performance of machine tools. [0003] Modal analysi...

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Problems solved by technology

The modal analysis and harmonic response analysis by the finite element method can qualitatively analyze the vibration characteristics of the machine tool and the dynamic response of the machine tool under the action of a simple harmonic load of a certain frequency, but cann...

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